FANUC Alarm Codes List

Below is a list of FANUC servo amplifier alarms and faults with a short description briefly describing the source of each error code. Some point to the source of the problem itself, others point to the problem and do not identify the failing/malfunctioning component.

Servo Amplifiers We Service

FANUC Alpha, Alpha i series & Alpha is series

FANUC AC Digital and Analog

FANUC AC Serial Interface

FANUC AC Series i & S

Tri Star CNC Services can provide you with more information on the meaning of your alarms. We will provide a fault diagnosis and a dependable 1-year warranty if you require servo repairs or parts replacement.

Fanuc Servo Amplifer Alarms

(a) Disconnect the feedback cable (JF*) from the Servo Amplifier, and then switch on the power.<1> If blinking continues → Replace the Servo Amplifier.<2> If blinking stops → Go to (b). (b) Disconnect the feedback cable (JF*) from the Pulsecoder, and then switch on the power. (Keepthe cable on the Servo Amplifier side connected.)<1> If blinking continues → Replace the cable.<2> If blinking stops → Replace the motor.

Overcurrent flowed into the input of the main circuit. Input supply voltage imbalance, IGBT defective. (PSM-15 to PSM-55)

The battery voltage of the absolute pulse coder is low. (warning)

The main circuit power module (IPM) has detected an overload, overcurrent, or control supply voltage decrease, overcurrent, or control supply voltage decrease. Internal cooling circuit failure, Overload, Input supply voltage imbalance, IPM failure, or control supply voltage decrease of the power module.

Position control system fault. Due to an NC or servo system fault in the reference position return, there is the possibility that reference position return could not be executed correctly. Try again from the manual reference position return.

5) Parameters No. 2084 and No. 2085 (flexible field gear rate) have not been set.

6) A value outside the limit of {1 to the number of control axes} or a non–continuous value (Parameter 1023 (servo axis number) contains a value out of the range from 1 to the number of axes, or an isolated value (for example, 4 not preceded by 3).was set in parameter No. 1023 (servo axisnumber). 7) The amplifier in use does not support the HC alarm avoidance function.

If you want to use this amplifier, reset the function bit 2209#4 to 0.

If you want to use the HC alarm avoidance function, use an amplifier that supports it.

The difference between the errors in the semi–closed loop and closed loop has become excessive during dual position feedback. Check the values of the dual position conversion coefficients in parameters No. 2078 and 2079.

The current control cycle settings (parameter No. 2004, bit 0 of parameter No. 2003, and bit 0 of parameter No. 2013) are incorrect.

Possible problems are as follows.

– For the two axes whose servo axis numbers (settings of parameter No. 1023) are an odd number followed by an even number (a pair of axes 1 and 2 or axes 5 and 6, for example), a different current control cycle is set for each of the axes.

– The requirements for slaves needed for the set current control cycle, including the number, type, and connection method of them, are not satisfied.